Harrowdale, is the name given to the deep north-south valley cut out of the White Mountains by the Snowbourn river. At its southern end, beneath the mountain known as the Starkhorn, stood Dunharrow, a great refuge of the Rohirrim. At its northern end, where the Snowbourn issued onto the plains of Rohan, stood that nation's capital, Edoras.
- The Atlas of Middle-earth, pg. 137